Development of a ductile fracture model considering stress triaxiality
and Lode angle influences
Abstract
In this paper, a fully-involved anisotropic failure model including the
effect of stress triaxiality and Lode angle proposed by Ganjiani
[Ganjiani, M., 2020. A damage model for predicting ductile fracture
with considering the dependency on stress triaxiality and Lode angle.
European Journal of Mechanics-A/Solids, 104048] is extended to predict
the fracture phenomena in the ma-terials. For considering the anisotropy
effects, Hill’s 48 yield function is used. The proposed model is applied
to construct the fracture loci and the corresponding Fracture Forming
Limit Diagram (FFLD) to validate the performance of the model. The
fully-involved anisotropic means that in constructing FFLD, the
anisotropy is involved on both the stress triaxiality and the fracture
strain. The predicted results are in good agreement with the
experimental data over a wide range of stress triaxialities. Comparison
between the current model and some fracture criteria is also provided,
and the results indicate the significant potential of the model to
predict ductile fracture as well as FFLD especially for anisotropic
materials.